Cameras begin rolling for Season 4 of AMC's top-rated series.

Cameras began rolling -- and zombies started stumbling about -- in Atlanta as production began Friday on Season 4 of AMC's top-rated series The Walking Dead.

The network released this teaser pic of star Andrew Lincoln to mark the occasion.

This is the first season under Dead's new showrunner, Scott Gimple, who takes the reins from Glen Mazzara. Gimple has been on the writing staff since Season 2 and penned six episodes, including the recent installment "Clear."